Using a Natural Clay Mineral as an Active Drug Carrier to Promote Hair Growth

TL;DR

A natural clay mineral called illite can deliver minoxidil for hair growth without causing irritation, and it may even help hair grow on its own.

Contribution

Illite acts as an effective, non-irritating drug carrier and shows intrinsic hair-growth-promoting activity.

Findings

Modified illite increased surface area and successfully loaded minoxidil.

Illite-based formulations showed equivalent efficacy to free minoxidil without solvent toxicity.

Illite increased cell proliferation and reduced apoptosis, suggesting pro-hair growth mechanisms.

Abstract

Background: Topical minoxidil remains the only FDA-approved treatment for hair loss, yet its clinical efficacy is compromised by organic-solvent-induced scalp irritation and poor patient adherence. This study aimed to evaluate natural illite as a carrier for minoxidil and to explore its potential hair-growth-promoting mechanisms. Methods: Thermal–acid-modified illite was engineered as a spray-dried, hydroalcohol-free minoxidil carrier for topical application. Hair regrowth efficacy was assessed in C57BL/6 mice via a 14-day depilation model. Mechanisms were elucidated via RNA-seq, Ki67/TUNEL immunofluorescence, and p-STAT3 immunohistochemistry. Results: Modified illite resulted in a 4.2-fold surface area increase and successful minoxidil loading. The minoxidil/illite formulation demonstrated efficacy equivalent to that of free minoxidil while also eliminating solvent toxicity. Mechanistic analysis revealed that illite functions as an active carrier: both the illite-alone and minoxidil/illite-treated groups exhibited increased Ki67+ proliferation and reduced TUNEL+ apoptosis. Transcriptomic profiling demonstrated dual mechanisms—enrichment of Myc proliferation pathways and suppression of IL-6 inflammatory signaling (p < 0.001)—with reduced p-STAT3 expression confirmed by immunohistochemistry. Conclusions: These findings suggest that an illite-based carrier can enable topical delivery of minoxidil with preserved efficacy and that illite itself exhibits intrinsic hair-growth-promoting activity via anti-inflammatory and pro-proliferative mechanisms, which may help alleviate adherence barriers associated with conventional topical alopecia therapy.

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